Free - Twin Disc MG-506 Troubleshooting Guide
Twin Disc MG 506 Marine Transmission Parts -
Individual Seals Section

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Reduction Ratios 2.50:1 and 2.96:1
Price: $ 35.77
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Reduction Ratios 1.50:1 and 1.97:1
Price: $ 44.58
Free - Twin Disc MG-506 Troubleshooting Guide